Blower



March 13, 1934-. F. w. PARKS ET AL BLOWER Filed Nov. 10, 1950 INVENTORS Fnsasmrx w; FHA/w 5511, SMHLLEV WWW h Patented Mar. 13, 1934 UNITED STATES PATENT OFFICE BLOWER of Delaware Application November 1%., l lli, Serial lloo chil -M3 ll Ell illiinvention relates to blowers i us= v d as embodied in a novel compact u use is roviding a blast of heat% air as r be utilised in drying the tires of an autumn mounted on a brake testing maclrine so that the tires will not slip on the dry rolls or the testing machine. Various features of novelty relate to the arrangement of the heating ele ment to act on the air, to the construction of the tool in two parts including a head and a handle having an advantageous relative arrangement, to the arrangement or the air passages so that the exterior of the tool will be kept cool even when the air is highly heated, a novel control element which is preferably arranged to control both the air and the electric current, and to various other novel and desirable features of construction which will be apparent from the following description of the illustrative embc ment shown in the accompanying drawing in which:

The figure is a section iongitu through the tool showing the parts in section.

While various features of the invention can be utilized in air blowers and the like for other purposes, we have particularly in mind a tool suitable for supplying a. blast of hot air which can be directed on the tires of an automobile to dry them so that they will not slip upon the dry rolls of a brake testing-machine. Having this object in mind, the device includes generally a cup-shaped head formed with an inner wall 10 and an outer wall 12 defining a cupshaped chamber between them through which the air passes so that the exterior of the wall 12 is always cool, even though the air blast is highly heated. The inner wall 10 is spun over and fitted into the mouth of the outer wall 12 and there secured by means such as set screws 14 which also hold a cover plate 1c.

The central part of the cover plate is drawn downwardly to form a cup-shaped deflector m which projects into the interior of the inner wall 10 to define an annular chamber 20* through which the air is directed by the deflector is as it enters through an opening 22 in the base of the inner wall 10. The cover plate lfiis formed with suitable openings 24, preferably arranged in an annular series opposite the annular chamber 20 through which the air is directed cutwardly in an annular current or blast.

The air is heated as it passes through the an nular chamber 20 by a suitable electric resistance coil or unit 26 arranged therein and one end of which is secured to a bracket 28 car- I as passing throug 'li a central pas age connecting an icon e space betwesn the walls or of the resistance unit 26. r resistance unit 26 is connected a bracket electrica ly connected through screw-threaded members 38 passing through insulating washers cc and 42 with. an insulated flexible conductor 1 i outside oi? the wall 12. The conductor 34 is also electrically connected to a member id passing through an insulated washer so in the base oi the outer well if: and which is connected with an insue rible conduct r A so in ctely allow handle 52, within which the conductors moi so are arranged, is secured to bow of the above-described dcublewolleci head by or other iastenings. lliie conductors so are connected, or one of is connects-c1, to a. switch El imounted inside o the handle which may be of any deslr rm which in turn is connected to a i 5% extending through an insulated.

with a spring such as a leaf spring 62 rigidly secured thereto and projecting through the side of the handle.

outwardly Pressure on the leaf spring 62 rocks the lever co to close the circuit through the resistance unit 26 and when the pressure on the spring s2 is released, the circuit is interrupted.

The handle also contains a pipe or outlet 64 projecting outwardly through the lower end of the handle and threaded to be attached to a flexible hose connection in the form found leading from the tanks in filling stations and service stations and which supplies air at approximately 15o pounds pressure for inflating tires and the like. The upper end of the conduit 84 is threaded into a plug 66 mounted inside of the handle and in communication with a passage 68 which communicates with a. valve chamber '70 within which is arranged a poppet valve 72 together with a valve spring 74 urging the valve against its sent. The part of the valve chamber 7s below the poppet valve 72 is connected by a passage lid with the annular space between the inner and outer walls 16 and 12 of the cup-shaped head described above.

According to an important feature of my invention a member such as a. lever '18 is pivoted in the handle so that it can be gripped by the hand with which the tool is carried and is' arranged with a part 80 adapted to open the valve 72 against the resistance of its spring 74 and has its lower end in engagement with the leaf spring 62 so that it operates the electric switch 54. The operating lever 78 is shown as being iulcrumed on a pivot 82 carried by the lower end of the plug 86.

By the above-described arrangement it will be seen that the tool can be carried in one hand and the same hand can be used to manipulate the lever 78 or its equivalent to open the valve 72 to provide a blast 01' air through the-tool and at the same time to close the circuit through the resistance element 26 to heat the air. It is also important to note that when the operator lays the tool down, he cannot fail to close the air valve or to turn off the electric current. As mentioned above, it is to be noted especially that all of the exterior parts of the tool are cooled by the current of air before it reaches the resistance element 26. This not only makes the tool easier to useybut also conserves the heat and makes sure that it is all utilized in heating the air blast.

While one illustrative embodiment has been.

described in detail, it is not our intention to limit the scope of the invention to that particular embodiment or otherwise than by the terms 01 the appended claims.

We claim:

1. A blower comprising a double-walled cupshaped member, an end member secured to the rims of said double walled cup-shaped member for closing off the space between the walls, heating means within its inner wall and an opening in the bottom of the inner wall and means for directing air into the space between the walls and thence through said opening across the heating means.

2. A blower comprising a double-walled cupshaped member, an end plate closing of! the space between the walls, heating means within its inner wall and an opening in the bottom of the inner wall and means for directing air into the space between the walls and thence through said opening across the heating means, and a deflector within the heating means directing the current of air from said opening outwardly over ti 3 heating means.

3. A blower comprising a double-walled cupshaped member, heating means within its inner wall and an opening in the bottom of its inner wall and means for directing air from the rear into the space between the walls and thence through said opening across the heating means, a deflector within the heating means directing the current of air from said opening outwardly over the heating means, said deflector being formed as a cap covering the cup-shaped doublewalled member.

4. A blower comprising a casing, a cup concentric therewith and spaced therefrom, a 010- sure for the cup and a deflector supported by the closure concentrically with respect to the cup.

5. A blower comprising a casing, a cup concentric therewith, a closure for the cup, a deflector supported by the closure concentrically with respect to the cup and a heating element supported by the cup in spaced relationto the 6. A blower comprising a casing, a cup supported thereby concentrically with respect thereto, a closure for the cup, a deflector supported by the closure, a heating coil supported by the cup between the cup and the deflector.

7. A blower comprising a casing having an opening therein for the admission of air under pressure, a cup supported concentrically with respect to the casing and providing in conjunction therewith an annular chamber opening into the cup, a coil supported within the cup, a closure for the cup having spaced openings and a deflector supported by the closure concentrically with respect to the coil.

8. A blower comprising a hollow handle, a plug positioned therein having a conduit, a valve in the handle for controlling the conduit, a switch in the handle and an operating lever pivoted on the plug for controlling the valve and actuating the switch simultaneously.

9. A blower comprising a casing having one end closed, a cup havinga flange fltted snugly in the other end 01' the casing and an opening communicating with a chamber between the outer wall of the cupand the inner wall of the casing, a coil supported by the cup concentrically with respect thereto, a closure for the cup having a part arranged concentrically with respect to the coil and openings communicating with the cup, a hollow handle secured to the closed end of the casing, a plug in the handle having a conduit communicating with the casing, a valve in the plug for controlling the conduit, a switch in the handle, leads from the switch to the coil and means pivoted on the plug for controlling the valve and actuating the switch simultaneously.

10. A hot air gun comprising a cup shaped outer casing, an inner cupped shaped casing containing a heater element, said inner cup having an outwardly turned flange upon the rim thereof adapted to be secured to the rim of the outer casing and an electrical connection for the heater element passing through and secured to the base of said inner cup and adapted to extend through the base of the outer casing.

11. A hot air gun comprising a labyrinth heater, and a handle secured to the rear of said heater, an air conduit passing longitudinally through said handle, a poppet valve having its axis longitudinally disposed in said handle, a switch, and a lever grip on one side of said handle adapted to open said valve and close said switch upon depression of the lever during gripping of the handle.

FREDERICK W. PARKS. LEE L. SMALLEY. 

